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.TH PTHREAD_ATTR_INIT 3C "Dec 10, 2015"
.SH NAME
pthread_attr_init, pthread_attr_destroy \- initialize or destroy threads
attribute object
.SH SYNOPSIS
.LP
.nf
cc -mt [ \fIflag\fR... ] \fIfile\fR... -lpthread [ \fIlibrary\fR... ]
#include <pthread.h>

\fBint\fR \fBpthread_attr_init\fR(\fBpthread_attr_t *\fR\fIattr\fR);
.fi

.LP
.nf
\fBint\fR \fBpthread_attr_destroy\fR(\fBpthread_attr_t *\fR\fIattr\fR);
.fi

.SH DESCRIPTION
.LP
The function \fBpthread_attr_init()\fR initializes a thread attributes object
\fIattr\fR with the default value for all of the individual attributes used by
a given implementation.
.sp
.LP
The resulting attribute object (possibly modified by setting individual
attribute values), when used by \fBpthread_create()\fR, defines the attributes
of the thread created. A single attributes object can be used in multiple
simultaneous calls to \fBpthread_create()\fR.
.sp
.LP
The \fBpthread_attr_init()\fR function initializes a thread attributes object (
\fIattr\fR) with the default value for each attribute as follows:
.sp

.sp
.TS
c c c
l l l .
Attribute	Default Value	Meaning of Default
_
\fIcontentionscope\fR	\fBPTHREAD_SCOPE_PROCESS\fR	resource competition within process
\fIdetachstate\fR	\fBPTHREAD_CREATE_JOINABLE\fR	joinable by other threads
\fIstackaddr\fR	\fBNULL\fR	stack allocated by system
\fIstacksize\fR	0	1 or 2 megabyte
\fIpriority\fR	0	priority of the thread
\fIpolicy\fR	\fBSCHED_OTHER\fR	traditional time-sharing policy
\fIinheritsched\fR	\fBPTHREAD_INHERIT_SCHED\fR	T{
scheduling policy and parameters are inherited from the creating thread
T}
\fIguardsize\fR	\fBPAGESIZE\fR	T{
size of guard area for a thread's created stack
T}
.TE

.sp
.LP
The \fBpthread_attr_destroy()\fR function destroys a thread attributes object (
\fIattr\fR), which cannot be reused until it is reinitialized. An
implementation may cause \fBpthread_attr_destroy()\fR to set \fIattr\fR to an
implementation-dependent invalid value. The behavior of using the attribute
after it has been destroyed is undefined.
.SH RETURN VALUES
.LP
Upon successful completion, \fBpthread_attr_init()\fR and
\fBpthread_attr_destroy()\fR return a value of  \fB0\fR. Otherwise, an error
number is returned to indicate the error.
.SH ERRORS
.LP
The  \fBpthread_attr_init()\fR function will fail if:
.sp
.ne 2
.na
\fB\fBENOMEM\fR\fR
.ad
.RS 10n
Insufficient memory exists to initialize the thread attributes object.
.RE

.sp
.LP
The  \fBpthread_attr_destroy()\fR function may fail if:
.sp
.ne 2
.na
\fB\fBEINVAL\fR\fR
.ad
.RS 10n
\fIattr\fR is invalid.
.RE

.SH ATTRIBUTES
.LP
See \fBattributes\fR(7) for descriptions of the following attributes:
.sp

.sp
.TS
box;
c | c
l | l .
ATTRIBUTE TYPE	ATTRIBUTE VALUE
_
Interface Stability	Committed
_
MT-Level	MT-Safe
_
Standard	See \fBstandards\fR(7).
.TE

.SH SEE ALSO
.LP
.BR pthread_attr_get_np (3C),
.BR pthread_attr_getdetachstate (3C),
.BR pthread_attr_getguardsize (3C),
.BR pthread_attr_getinheritsched (3C),
.BR pthread_attr_getschedparam (3C),
.BR pthread_attr_getschedpolicy (3C),
.BR pthread_attr_getscope (3C),
.BR pthread_attr_getstackaddr (3C),
.BR pthread_attr_getstacksize (3C),
.BR pthread_attr_setdetachstate (3C),
.BR pthread_attr_setguardsize (3C),
.BR pthread_attr_setinheritsched (3C),
.BR pthread_attr_setschedparam (3C),
.BR pthread_attr_setschedpolicy (3C),
.BR pthread_attr_setscope (3C),
.BR pthread_attr_setstackaddr (3C),
.BR pthread_attr_setstacksize (3C),
.BR pthread_create (3C),
.BR sysconf (3C),
.BR attributes (7),
.BR standards (7)
